UNEP DATABANK OF LABORATORIES ANALYZING PERSISTENT ORGANIC POLLUTANTS
"POPS LABORATORY DATABANK"

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4 Sampling According to Matrix: High Frequency (++), Low Frequency (+) 

Matrices of Interest GMP Matrices
Pesticides + DDT + HCB
The Laboratory + ++ + ++
Other Laboratory
Client
Nurse / Physician
The lab. provides sampling equipment + ++ + ++
The lab. specifies the sampling procedure + ++ + ++
Other

* Proposed as a useful matrix by GMP Group (2010)